FreeMarker学习

1：${…} ：取值

${errorMsg!""}

2：!"默认值" ：默认值

1的默认值为空字符

3：？？ 判断是否存在

(USER_CONTEXT.userName)?? 将判断USER_CONTEXT和USER_CONTEXT.userName是否存在null

USER_CONTEXT.userName?? 将判断USER_CONTEXT.userName是否存在null

4：if 指令

<#if (USER_CONTEXT.userType)?? &&(USER_CONTEXT.userType == 2)>

</#if>

if else 指令

<#if (USER_CONTEXT.userName)??>

${USER_CONTEXT.userName},欢迎您的到来,<a href="/forum/login/doLogout.html">注销</a>

<#else>

<a href="/forum/logini.html">登录</a>

<a href="/forum/register.html">注册</a>

</#if>

5:list指令

<#list boards as board>

<tr>

<td><a href="/forum/board/listBoardTopics-${board.boardId}.html">${board.boardName}</a></td>

<td>${board.boardDesc}</td>

<td>${board.topicNum}</td>

</tr>

</#list>

6：日期格式化

${createTime?string('yyyy-MM-dd HH:mm')